netdev - Re: [RFC,PATCH] loopback: calls netif_receive_skb() instead of netif

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Date:	Mon, 3 Mar 2008 21:15:35 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	dada1@...mosbay.com, netdev@...r.kernel.org
Subject: Re: [RFC,PATCH] loopback: calls netif_receive_skb() instead of
 netif_rx()

On Mon, 03 Mar 2008 20:55:58 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> From: Eric Dumazet <dada1@...mosbay.com>
> Date: Sat, 01 Mar 2008 11:26:17 +0100
> 
> > You are absolutly right. We should guard against recursion, using a new field 
> > in "pcpu_lstats" (cheap access in a hot cache line as we have to update stats 
> > anyway)
>  ...
> > [PATCH] loopback: calls netif_receive_skb() instead of netif_rx()
> 
> I'm willing to seriously entertain this change and stick it
> into net-2.6.26 if you will perform a reasonable deep stack
> test.
> 
> For example, create an XFS filesystem, and mount it NFS over
> loopback.  Then stress it like crazy.
> 
> See if this generates stack overflows or weird crashes.
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Also (unrealistic) benchmarks often test loopback performance, so you
should also check for performance gains/losses in things like
netbench, netperf, tbench, etc.
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